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May 18: Nightly News Friday broadcast

Tornado risk increases in the Plains; Dozens injured in Connecticut train collision; Plane makes belly landing in Newark; Car drives into crowd at parade; Obama tries to do damage control; IRS scandal could be most damaging; Officer once hailed as hero now facing charges; Record jackpot up for grabs in Powerball drawing; More young people having strokes, study says; Once the pride of a president, ship now decaying.